I will bet that the time shifted viewing will be up for this week because of the Thanksgiving Day holiday in the U.S. (Meaning a lot of people traveled for the 4 day holiday weekend (and many left during the previous weekend, especially with a major winter storm hitting the U.S. east coast just before the holiday.
From what I saw, a lot of the shows on the broadcast nets were lower Friday night, so it isn't just TAR that had this issue.